DEVELOPMENT. 



711 



not the result of a mere mechanical action, by which the organ is 

 dragged down to a lower position, but rather one change out of many 

 which attend the gradual development and re-arrangement of these or- 

 gans. It may be repeated, however, that the details of the process by 

 which the descent of the testicle into the scrotum is effected are not ac- 

 curately known. 



The homologue, in the female, of the gubernaculum testis is a struc- 

 ture called the round ligament of the uterus, which extends through the 

 inguinal canal, from the outer and upper part; of the uterus to the sub- 

 cutaneous tissue in front of the symphysis pubis. 



At a very early stage of foetal life, the Wolffian ducts, ureters, and 



FIG. 499. 



FIG. 501. 



FIG. 502. FIG. 500. 



Urinary and generative organs of a human female embryo, measuring 3% inches in length. 



FIG. 499. General view of these parts; 1, suprarenal capsules; 2 kidneys; 3, ovary; 4, Fallo- 

 pian tube; 5, uterus; 6, intestine; 7, the bladder. 



FIG. 600. Bladder and generative organs of the same embryo viewed from the side; o, the uri- 

 nary bladder (at the upper partis a portion of the urachus) ; 2, urethra; 3,Iuterus (with two cornua) ; 

 4, vagina; 5, part as yet common to the vagina and urethra; 6, common orifice of the urinary and 

 generative organs; 7, the clitoris. 



FIG. 501. Internal generative organs of the same embryo;!, the uterus; 2, the round ligaments; 

 3, the Fallopian tubes ^formed by the Miillerian ducts); 4, the ovaries; 5, the remains of the Wolf- 

 fian bodies. 



FIG. 502. External generative organs of the same embryo; 1, the labia majora; 2, the nymphae, 

 3, clitoris; 4, anus. (Muller.) 



Miillerian ducts, open into a receptacle formed by the lower end of the 

 allantois, or rudimentary bladder ; and as this communicates with the 

 lower extremity of the intestine, there is for the time, a common recep- 

 tacle or cloaca for all these parts, which opens to the exterior of the body 

 through a part corresponding with the future anus, an arrangement 



